zentara did indeed answer the question you asked, but it's probably not the question that you wanted to ask :) If you are really asking "how can I open the file, remove the comments, and then close it (ie not create an additional file)", the answer is that, in general, you can't. If you read the section on open he quoted, it tells you so. You can use perl -i, which says it modifies the file in place, but if you read the fine print, you'll see that it actually uses 2 files. There are ways to use just one file, but that is an exercise left to the user fnord
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